function changeDivVisibility( radioId )
{
	var radio = document.getElementById( radioId );
	var div;
	var vSpacer = document.getElementById( "vSpacer" );
	
	switch( radioId )
	{
		case"authorRadio":						
			var divOne   = document.getElementById( "authorDiv" );
			var divTwo   = document.getElementById( "coauthorDiv" );
			var divThree = document.getElementById( "auditDiv" );				
			vSpacer.innerHTML = "<img src='images/spacer.gif' width='1' height='243'/>";
		break;
		
		case"coauthorRadio":
			var divOne   = document.getElementById( "coauthorDiv" );
			var divTwo   = document.getElementById( "authorDiv" );
			var divThree = document.getElementById( "auditDiv" );
			vSpacer.innerHTML = "<img src='images/spacer.gif' width='1' height='288'/>";
		break;
		
		case"auditRadio":
			var divOne   = document.getElementById( "auditDiv" );
			var divTwo   = document.getElementById( "coauthorDiv" );
			var divThree = document.getElementById( "authorDiv" );
			vSpacer.innerHTML = "<img src='images/spacer.gif' width='1' height='153'/>";
		break;
	}	
				
	divOne.style.display  ="inline";
	divTwo.style.display  ="none";
	divThree.style.display="none";	
}

function changeDetails()
{
	var select = document.getElementById("studies");
	var div = document.getElementById("details");
	
	div.innerHTML = select.options[ select.selectedIndex ].value;
}

function SetNights(nr){
	//alert('here');
	obj = null; //nr = 0;
	if(nr == 0){
		if(document.getElementById('hotel1').checked){ obj = document.getElementById('hotel1'); nr = 1;}
		if(document.getElementById('hotel2').checked){ obj = document.getElementById('hotel2'); nr = 2;}
			}
	else{
		 obj = document.getElementById('hotel'+nr);
	}

	
	if(obj){
		if(obj.checked){
			var tabStart = document.getElementById("start_date").value.split("-");
			var tabEnd   = document.getElementById("end_date").value.split("-");

			var dtStDate   = tabStart[2]+","+tabStart[1]+","+tabStart[0];
			var dtEndDate = tabEnd[2]+","+tabEnd[1]+","+tabEnd[0];

			dtStDate    = new Date(tabStart[2], tabStart[1], tabStart[0]);
			dtEndDate = new Date(tabEnd[2], tabEnd[1], tabEnd[0]);
			
			var one_day=1000*60*60*24;  
			if(dtStDate !="NaN" &&  dtEndDate !="NaN")  {
				var nights = Math.ceil((dtEndDate.getTime()-dtStDate.getTime())/(one_day));
				if(nights >0){				
					document.getElementById("nr_nights"+nr).value=nights;
					document.getElementById("nr_nights"+nr).style.color = "#4a5b27";
				}
				else{
					document.getElementById("nr_nights"+nr).value=0;
					document.getElementById("nr_nights"+nr).style.color = "#ff0000";
				}
			}
			if(nr == 1){
				//document.getElementById('hotel1').checked=true;
				document.getElementById('hotel2').checked=false;
				document.getElementById("nr_nights2").value = ""; 
				
			}
			else if(nr == 2)  {
				//document.getElementById('hotel2').checked=true;
				document.getElementById('hotel1').checked = false;		
				document.getElementById("nr_nights1").value = ""; 
				
			}
		}
		else{
			document.getElementById('nr_nights'+nr).value = "";
		}
	}
}

function SetNightsHotel(){
	//alert('here');
	obj = null; nr = 0;
	
	if(document.getElementById('hotel3').checked){ obj = document.getElementById('hotel3'); nr = 3;}
	else{document.getElementById("nr_nights3").value = "";	}
	if(obj){
		if(obj.checked){
			var tabStart = document.getElementById("start_date").value.split("-");
			var tabEnd   = document.getElementById("end_date").value.split("-");

			var dtStDate   = tabStart[2]+","+tabStart[1]+","+tabStart[0];
			var dtEndDate = tabEnd[2]+","+tabEnd[1]+","+tabEnd[0];

			dtStDate    = new Date(tabStart[2], tabStart[1], tabStart[0]);
			dtEndDate = new Date(tabEnd[2], tabEnd[1], tabEnd[0]);
			
			var one_day=1000*60*60*24;  
			if(dtStDate !="NaN" &&  dtEndDate !="NaN")  {
				var nights = Math.ceil((dtEndDate.getTime()-dtStDate.getTime())/(one_day));
				if(nights >0){				
					document.getElementById("nr_nights"+nr).value=nights;
					document.getElementById("nr_nights"+nr).style.color = "#4a5b27";
				}
				else{
					document.getElementById("nr_nights"+nr).value=0;
					document.getElementById("nr_nights"+nr).style.color = "#ff0000";
				}
			}
	
		}
	}
}

function ChangeVisibilityLunch(nr){
	if(nr == 1){ 
		document.getElementById('lunch1').checked == true;
		document.getElementById('lunch2').checked=false;
	}
	else{
		document.getElementById('lunch2').checked == true;
		document.getElementById('lunch1').checked=false;
	}
}

function  ChangeVisibilityDinner(nr){
	if(nr == 1){ 
		document.getElementById('dinner1').checked == true;
		document.getElementById('dinner2').checked=false;
	}
	else{
		document.getElementById('dinner2').checked == true;
		document.getElementById('dinner1').checked=false;
	}
}

function  ChangeVisibilitySpecial(nr){
	if(nr == 1){
		document.getElementById('special_nu').checked = false;
	}
	else{
		document.getElementById('special_da').checked = false;
	}
}